update transformers version to 4.38.2

[suparious]

The referenced commit of ae49b218c3d718df90d8e4a109016450fb8f0632 has been merged to master branch and released in transformers 4.38.1 here: #2970.

This change ensures that users can use the officially released version of this library.

[teknium1]

Can you change it to simply have transformers as a requirement and it will install the latest, seems staying on latest would work better